We had a great stay at Gerd's apartment, which is in a perfect location (next to both BTS and MRT). Gerd's checkout instructions were super clear and offered many tips. The apartment itself is very spacious and nice with many helpful touches. Gerd is accessible pretty much anytime, and is very easy to approach and communicate with.
The flexible checkout option was super helpful for us as our flight departed at night. Even if late checkout was not an option that day it would have been possible to leave our bags and pick them up later (and also shower).
I know where I'll be looking to stay during my next trip to Bangkok! Thanks Gerd!!